Netlink: Support glibc (#600)

- Closes #491.

Sources/ContainerizationNetlink/NetlinkSocket.swift

@@ -49,12 +49,20 @@ public enum NetlinkSocketError: Swift.Error, CustomStringConvertible, Equatable
     }
 }
 
+#if os(Linux)
 #if canImport(Musl)
 import Musl
 let osSocket = Musl.socket
 let osBind = Musl.bind
 let osSend = Musl.send
 let osRecv = Musl.recv
+#elseif canImport(Glibc)
+import Glibc
+let osSocket = Glibc.socket
+let osBind = Glibc.bind
+let osSend = Glibc.send
+let osRecv = Glibc.recv
+#endif
 
 /// A default implementation of `NetlinkSocket`.
 public class DefaultNetlinkSocket: NetlinkSocket {

Sources/ContainerizationNetlink/Types.swift

@@ -15,7 +15,6 @@
 //===----------------------------------------------------------------------===//
 
 import ContainerizationExtras
-import Foundation
 
 struct SocketType {
     static let SOCK_RAW: Int32 = 3